Yes, the card will detect if you don't have both plugged in and will exhibit strange behavior if it works at all.
The PCI-e plugs provide power, if it tried to run at full power with just a single one it could end up overstressing the PCI-e slot and the other plug.
Yes, the card will detect if you don't have both plugged in and will exhibit strange behavior if it works at all.
The PCI-e plugs provide power, if it tried to run at full power with just a single one it could end up overstressing the PCI-e slot and the other plug.